Warp stop-motion for looms



Patented Apr. 25, I899;

J. H. NORTHRDP.

WARP STOP MOTION FOR LOOMS.

(Application filed Aug. 19, 1898.)

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Jzmeslf iJNii-nn Stains JAMES H. NORTHROP, OF HOPEDALE,

i ATENT @rrrcn.

MASSACHUSETTS, ASSIGNOR TO THE WARP STOP=MOTION FOR LOOIVIS.

SPECIFICATION forming part Of Letters Patent No. 623,732, dated. April 25, 1899.

Application filed August 19, 1898. Serial No. 688|96L (N model.)

To a whom it may concern.-

Be it known that I, JAMES H. NORTHROP, of llopedale, county of "Worcester, State of Massachusetts, have invented an Improvement in 1 WVa-rp Stop-Motions for Looms, of which the following description, in connection with the accompanying drawings, is a specification, like letters and figures on the drawings representing like parts.

This invention has for its object the production of warp-stop-motion mechanism for looms whereby the engagement of a normallyvibrating feeler with an abnormallypositioned detector subjects the latter to a tensile strain, thus obviating any tendency to twist the detector.

My invention thus relates to that type of stop-motion mechanisms wherein the failure or undue slackness of a warp-thread results in the abnormal positioning of a detector made as a thin fiat strip of sheet metal having a thread-receiving opening, such positioning stopping the normal movement of a cooperating feeler, and thereby effecting the automatic stopping of the loom.

Figure 1 is a longitudinal sectional View of a part of a loom embodying my inventi0n,taken on the line so 00, Fig. 2. Fig. 2 is a partial rear elevation of the loom shown in Fig. 1. Fig. 3 is a detail showing an abnormally-positioned detector, and Fig. 4 is an enlarged side elevation of a detector.

The greater portions of the mechanism of the loom proper are omitted in the drawings, as they form no part of this invention; but the harnesses H, shipper-handle S, whip roll or bar W, and lease-rods L L may be and are of usual or well-known construction.

I have herein shown a series of warp-stopmotion controlling or actuating detectors d as located back of the lease-rods, Fig. 1, and provided each with a thread-receiving opening d and an elongated slot (1 near its-upper end, a flat bar h, set on edge, being extended through the slots (Z and rigidly secured to stands B,attached to the loom-frame A. Two rods 3 i extend across the loom in front of and back of the detectors and serve as warp-rests back-stop 5 extend in front of the detectors, near their lower ends. The brackets B have bearings b for a roek-shaft a, provided with arms a, to which a feeler a is attached,

shown as an angle-iron having a continuous edge 6 toward the detectors, the path of movement of the feeler being normally below the lower ends of the detectors, which are held by unbroken and taut warp-threads in the position shown in Fig. 1. Each detector is notched at one edge, as at 61 near its lower end, as herein shown, the notches of the detectors being located at the edges toward the feeler, and when a thread fails or becomes unduly slack its detector moves into the position shown in Fig. 3, being supported by the 65 bar I). When in such abnormal position, the forward and downward movement of the feeler causes it to enter the notch of and engage the detector on the shoulder formed by the transverse bottom or stop portion 8 of the notch, Fig. 4, the feeler being stopped in its movement by'such engagement. As the forward-and-downward movement of the feeler is due to gravity, the strain of the stoppage is brought upon the detector through the stop 8, and by the construction herein shown such strain is tensile, being resisted by the supporting-bar 1), extended through the said detectors, inasmuch as the strain is substan tially in the direction of a tangent to the are described by the feeler at-the point at which it contacts with the detector, and by reference to Fig. 3 it will be seen that such 7 tangent is parallel to the length of the detector, a portion of the are described by the feeler beingindicated by dotted lines. has much as there is thus a pull on the detector in the direction of its length, it has no tendency to twist or be bent when engaged by the feeler, and, furthermore, as there is no twisting tendency it is unnecessary to notch the engaging edge of the feeler, as has been done heretofore to avoid bending or distorting the detector. Even should the latter be turned somewhat out of a plane substantially 5 parallel to the warp-threads no damage will be effected by the engagement and stoppage for the warp-threads w,while a guide-rod and l of the fceler.

Any suitable mechanism may be employed to effect the normal vibration of the feeler and to operate the stopping means for the loom, the mechanism herein shown being one convenient form, however, which will be briefly described.

The rock-shaft a has preferably a slotted arm a to which is pivotally connected by a stud 50 a depending bent arm (6, provided with a hunter a and a toe a which travels on the edge of a cam D, preferably on the usual cam-shaft C of the loom, the hunter a being moved by said cam into and out of the path of one or more tappets f of a tappet-cam F, fast on said shaft C. If the feeler is stopped by a dropped detector, the hunter a is held up in the path of the tappets, and engagement with one of them swings the arm a to the rear. A slot a in the arm receives a stud (Z of a short lever (1 pivoted at its upper end at (Z to a link (1 hooked around the cam-shaft, as at (Z and jointed at its other end to an arm 6 of a rock-shaft e having a knock-off arm 6 to engage and release the shipper-lever S from its usual holding-notch. A rod 6 connects the lower end of lever d and the arm 6, the connection a acting as the fulcrum for the lever when the hunter a is acted upon by the tappet-cam F, the swing of the upper end of said lever moving the link (1 longitudinally to operate the knock-off arm a and release the shipper-handle S. The weight of the arm a and its connected parts serves to swing the feeler toward the detectors and to keep the toe a on the cam D, the reverse swing of the feeler being controlled by said cam.

My invention is not restricted to the precise construction and arrangement shown, as I have shown herein an operative mechanism embodying one form of my invention, and the construction and arrangement herein may be varied or rearranged without departing from the spirit and scope of my invention.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a loom, a series of longitudinally-sliding stop-motion-controlling detectors maintained in inoperative position by normal warpthreads, a normally-vibrating feeler adapted to engage and subject to tensile strain a detector abnormally positioned by breakage or undue slackness of its warp-thread, means to resist such tensile strain upon a detector, and a stop-motion for the loom, operated by or through the stoppage of the feeler.

2. In a loom, a series of longitudinally-slotted stop-motion -controlling detectors governed as to their position by the warp-threads, each detector having a notch in one edge, a cooperating, normally-vibratin g feeler adapted to enter the notch of and be stopped by a detector abnormally positioned by failure or undue slackness of its warp-thread, a fixed support extended through the slots of the detectors and resisting the tensile strain to which a detector is subjected by stoppage of the feeler, and a stop-motion for the loom, operated by or through abnormal positioning of a detector.

3. In a loom, a series of longitudinally-slotted stop-motion-controlling detectors governed as to their position by the warp-threads, a fixed support extended through said slots and relative to which the detectors have a limited longitudinal movement, a normallyvibrat-ing feeler adapted to engage and be stopped by an abnormally-positioned detector when sustained by said support, said detector being at such time subjected to tensile strain between the support and feeler, and a stopmotion for the loom, operated by or through stoppage of the feeder.

4:. In a warp-stop-motion mechanism for looms, a normally-vibrating feeler having a continuous-acting edge, stopping means for the loom operated by or through stoppage of the feeler, a series of controlling-detectors held by normal warp-threads out of the path of the feeler and adapted to be engaged and subjected to tensile strain by the feeler upon failure or undue slackness of a warp-thread, to stop the feeler, and fixed means to support an engaged detector and resist said strain, said detectors being bodily movable in the direction of their length relatively to said supporting means.

5. In a warp-stop-motion mechanism for looms, a normally-vibrating feeler having a continuous-acting edge, stopping means for the loom operated by or through stoppage of the feeler, a series of thin, flat controlling-detectors having each a thread-receiving opening and a transverse feeler-stop, said detectors being held by normal warp-threads with their feeler-stops above the path of the feeler, failure or undue slackness of a warp-thread permitting its cooperating detector to descend and bring its stop in the downward path of the feeler, to engage and stop the latter with tensile strain on the detector, and means to support an engaged detector and resist such strain,said detectors being movable vertically relatively to said supporting means.

6. In a loom, a series of longitudinally-sliding controlling-detectors maintained inoperative by normal warp-threads, a cooperating moving feeler adapted to engage and subject to tensile strain a detector in operative position due to failure or undue slackness of its warp-thread, means to resist such tensile strain upon a detector, and a stop-motion for the loom, actuated by or through operative engagement of the feeler and a detector.

, 7. In a loom, a series of movable stop-motion-controlling detectors governed as to their position by the Warp-threads and having each a transverse shoulder, a support for and to resist tensile strain upon the detectors, said detectors being movable longitudinally rela- In testimony whereof I have signed my tively to said support a cooperating feeler name to this speeifieationin the presence of 10 adapted to engage the transverse shoulder of two subscribing Witnesses.

and subject an abnormally-positioned deteotor to tensile strain, and a stop-motion for JAMES NORTHROP' the loom, actuated by or through operative YVitnesses:

engagement of the feeler and the shoulder of GEO. OTIS DRAPER,

adeteotor. ALBERT I-I. CoUsINs.

It is hereby certified that in Letters Patent No. 623,732, granted April 25, 1899, upon the application of James H. Northrop, of Hopedalc, Massachusetts, for an improvement in Warp Stop-Motions for Looms, an error appears in the printed specification requiring correction as follows: In line 84, page 2, the Word feeder, should read feeler; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oflice.

Signed, countersigned, and sealed this 9th day of May, A. D., 1899.

[SEAL-1 WEBSTER DAVIS,

Assistant Secretary of the Interior. Gountersigned:

O. H. DUELL,

Commissioner of Patents. 

